Light and Optical Systems Review

What is light?

• a form of energy you can see
• waves of matter
• charged atoms
• a visible form of matter

What is light made up of?

• photon particles
• waves of electromagnetic radiation
• solid matter
• both a and b

Light travels in…

• straight line waves
• zig zag patterns
• continuous circles
• no predictable pattern

An object is considered a source of light if it…

• absorbs visible energy
• reflects visible energy
• gives off visible energy
• All of the above

Which of the following is NOT a natural light source?

• Cell phone
• Sun
• Firefly
• Bioluminescent algae

Angler fish produce light to catch their food through which process of light production?

• incandescence
• fluorescence
• chemiluminescence
• bioluminescence

Which of the following would best prove that light travels in a straight direction?

• Placing an object outside and measuring the change in temperature
• Casting a shadow by placing an object in front of a light source
• Shining a light source through a glass of water
• Increasing the brightness of a light source to illuminate a room

How did the invention of the telescope change our understanding of space?

• It allowed people to draw maps of Earth.
• It proved the Earth is flat.
• It helped observe stars, planets and galaxies more clearly.
• It helped measure rainfall.

Why was the development of optical devices important to science?

• They allow better observation of the natural world
• They helped make fashion accessories
• They proved that light doesn't exist
• They made night vision unnecessary

What happens to light rays when they strike an opaque material?

• They pass through completely.
• They bend and scatter.
• They are completely blocked.
• They change colour.